Commutator.



UNITED STATES PATENT OFFICE.

WILLIAM AJDI CK, OE PITTSBURG, PENNSYLVANIA, ASSIGNOH, -'.BY MESNE ASSIGN- MEN'IS, T0 WESTINGHOUSE ELECTRIC &'MANUFACTUBI NG COMPANY, OF. EAST PITTSBURG, PENNSYLVANIA.

commo rn'ron.

Specification of Letters Patent. Patenteid Sept. 28, 1909.

Ap ilication'filed November 8,1907. Serial m. 4o1,273'.

To all whom it may concern:

- Be it known that I, \VILLIAM A. DICK,

a Citizen of the United States, and a resident of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented. a new and useful Improvement in Commutators, of which the following is a My invention. relates to dynamo-electric machines, and it has special reference to the relatively large size.

The object of my invention isto pi'ovi de commutator-s of direct current machines of 1 an improved commutator neck or strip whereby the cross connectors and other portions of the winding, which are-usually inaccessible, may be readily uncovered fori repairs. The necks or connecting strips which radiate lt'rom the commutator bars are so close together that it is usually impossible to getv at the cross connectors and. other parts of the winding without entirely removing the commutator after disconnecting all of the bars. In order-to avoid this great labor and expense, I have provided a hinge joint in the commutator neck or bar, so that, if a bars are disconnected from 'the winding'and the outer sections of the necks are rotated about their hinge ins the cross-connectors and a ortion of the winding become accessible.

The single figure of the accompanying drawing is a longitudinal section of a portion of a dynamo-electrlc machine embodying my invention.

' Referring to the drawing, the machine illustrated comprises a shaft 1,'a magnetizable core 2, a spider 3 on which said core is supported, a commutator cylinder 4 and a winding 5. The bars of the commutator cylinder 4 are mounted upon a spider 6 having a Vprojection 7 and are held in position bya clamping V-ring 8, in accordance with well-known practice. The winding 5 comprises a plurality of coils, the ends of which are joined to the commutatorbars by necks or strips 9.

On the inner end of the commutator spider an annular bracket 10 is provided which supports cross-connectors 1 1 that join equi-potentialpoints in the winding, in the usual manner. It will be observed that a portion of the winding and the cross-connectors are located between the commutator necks and the spider and core. Access may be had to these. parts by disconnecting a. number of commutator necks from the extremities of the windings with which they are-associated and rotating a section 12 of each commutator neck about a hinge pin 13,

as indicated by broken lines'in the drawing. By making the hinge joints in the commutator necks close to the commutator bars; the. best results will obviously be-secured. Thev portions 14 of the necks may be integral parts of the bars or theymay be rigidly secured to the bars by any suitable means. I desire that myinvention shall not be restricted to the arrangement shown and de-.

scribed, and that only such limitations shall be imposed as are indicated-in the appended claims.

I claim as my invention;- 1. A commutator neck comprising a plurality ofvhinge-"connected parts.

2. A commutator bar having a neck or strip comprising two parts connected toget-her by a hinge joint.

3. The combination wit-h a commutator bar, of a neck or connecting strip comprising a part rigidly secured to the bar and an extension secured to said part by a hinge joint. 7

4. The combination with a commutator bar, of a two-part neck or connecting strip the parts of which are connected together by a hinge joint, said joint being relatively near to the junction of the neck and the bar.

5. In a dynamo-electric machine, the combination with a magnetizable core, a winding and a commutator cylinder comprising a plurality of bars or segments, of connecting strips or necks which join the winding and the bars and severally comprise a plurality of hinge connected parts.

In testimony whereoil have hereunto subscribed my name this 28th day of Qct., 

